Update on Swine Enteric Coronavirus Disease in US

US - The number of pig farm samples that are confirmed positive for porcine epidemic diarrhoea virus (PEDV) in the last week was 23, and there was one premises with dual infection of PEDV and porcine deltacoronavirus (PDCoV).

For the latest week – 30 November to 6 December 2014 – there were 23 new confirmed positive premises for PEDV and four presumed positive.

For the same period, no premises were confirmed for PDCoV and one presumed positive.

There was one confirmed premise with a dual infection (both PEDV and PDCoV) and two presumed positive.

The total numbers of confirmed positive premises for the latest week were 551, 25 and 20 for PEDV, PDCoV and the dual infection, respectively.

Since 5 June, for PEDV, there have been 568 confirmed positive premises, 344 presumed positive and nine previously positive premises that have attained negative status.

For PDCoV, the total for the same period are 27, 25 and two, respectively. For the dual infection, the totals are 20, 26 and one, respectively.

Table 1. Number of SECD confirmed and presumptive positive premises by month and production class(includes PEDV, PDCoV and dual infections; confirmed/presumptive)

Month

Nursery

Wean to finish

Farrow to finish

Finisher

Sow/breeding

Unknown

Jun-14

17 / 10

29 / 16

14 / 8

22 / 29

46 / 43

14 / 51

Jul-14

25 / 9

36 / 7

6 / 5

20 / 12

32 / 11

16 / 33

Aug-14

15 / 8

17 / 6

2 / 5

25 / 10

10 / 6

10 / 22

Sep-14

17 / 6

21 / 7

2 / 2

30 / 8

29 / 6

6 / 12

Oct-14

1 / 4

24 / 5

2 / 0

33 / 15

6 / 2

12 / 8

Nov-14

4 / 1

4 / 3

1 / 0

34 / 3

10 / 7

18 / 4

Missing

2 / 3

1 / 2

-

0 / 1

2 / 5

0 / 4

Total

81 / 38

132 / 44

27 / 20

164 / 78

135 / 80

76 / 135

Table 2. Biological accessions tested and number positive by month(since 5 June 2014)

PEDV

PDCoV

Month

Tested

Positive

% positive

Tested

Positive

% positive

Total before 5 June 2014

21,228

6,976

29.4

2,172

260

12.0

Jun-14

2,768

407

14.7

824

80

9.7

Jul-14

3,555

410

11.5

1,195

46

3.8

Aug-14

3,095.0

312

10.1

1,193

18

1.5

Sep-14

3,143

261

8.3

1,338

11

0.8

Oct-14

3,304

299

9.0

1,899

19

1.0

Nov-14

2,504

304

12.1

1,554

30

1.9

Dec-14 to date

771

110

14.3

450

5

1.1

Total since Jun-14

19,140

2,103

11.0

8,453

209

2.5

Grand total

40,268

9,079

22.5

10,625

469

4.4

Location of Positive Premises

PEDV

There are currently 33 states with at least one confirmed positive case of PEDV, following the addition of Hawaii in mid-November 2014.

For the current week (30 November), there were 110 PEDV-positive laboratory accessions, bringing the total since 5 June 2014 to 2,103. Iowa reported 18 of these new cases; Kansas, 13; North Carolina, 12 and Minnesota, 11.

PDCoV

There are currently 17 states with at least one confirmed positive case of PDCoV.

For the current week (30 November), there were five PDCoV-positive laboratory accessions, bringing the total since 5 June 2014 to 204. There were two positive premises each in Iowa and Illinois and one in Minnesota.